We have just been informed by Aer Lingus that they are cancelling our booking (flights to the US in their Summer sale) as they made a mistake putting the prices up on their website. They are offering a refund but that won't cover the cost of rebooking the flights as they've upped all the prices now. The difference will be around €600! The ODCA won't give us a clear answer on whether we're entitled to insist on a replacement ticket rather than the refund. Anyone have any advice? Is there anything we can do?